hot air furnace



(No Model.) 2 Sheets-Sheet 1.

A. MANN. 'HOT AIR FURNACE.-

No. 311,502. Patented Feb. 3, 1885.

(No Model.) 2 Sheets-Sheet 2.

A. MANN.

HOT AIR FURNACE.

No. 311,502. Patented Feb. 3,188 p All" Nl'FFD Parent triers,

ABRAM MANN, OF KANSAS CITY, MISSOURI.

HOT-AIR FURNACE.

JPECIFICATIOZ forming part of Letters Patent No. 311,502, dated February 3, 1885.

Application filed February 6, 1884. (No model.)

To all whom, it may concern:

Be it known that I, ABRAM llIANN, a citi zen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Hot-Air Furnaces, of which I do declare the following to be a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

. My present invention relates to that class of hot air furnaces commonly known as brick-set furnaces, and has for its object to provide a furnace of such improved construction that the products of combustion, before discharging into the chimneyflue, may be forced to part with the greatest possible amount of heat for the purpose of warming the air to be used for heating purposes.

To this end my invention consists in the novel construction and arrangement of parts hereinafter described, illustrated in the drawings, and particularly defined in the claims at the end of the specification.

Figure l is a view of the improved furnace in vertical longitudinal section. Fig. 2 is a view in transverse vertical section on line 0000 of Fig. 1. Fig. 8 is a view in transverse vertical section 011 line 1 3 of Fig. 1, parts being shown in elevation in both Figs. 2 and 3.

A designates the base of the furnace, in which are formed suitable induction-ports, a and a, for the delivery to the furnace of the air to be heated.

A denotes the side walls, A the front wall, and A the back or chimney wall, of the heating-chamber, having the dome or cover A, provided with a suitable flue, a for the discharge of the heated air.

Upon the top wall of the base A, near its front, rests the ash-pit B, and above this ashpit is the fire-box O and expanded combustion'chamber D.

Suitable doors, 0 and b, are provided in the side wall, A, for the fire box and ash-pit, through which fuel may be fed and ashes withdrawn.

In the rear side of the base cl of the combustion-chamber openings are formed, in which are held the lower ends of the series of airpipes E, which areinclined as shown, and

have their upper ends held in suitable openings in the top (1 fthe combustion-chamber. These pipes E are open from end to end, to permit the free passage of the air through them, and are placed at such distance apart as to cause the products of combustion to pass between and around them before entering the discharge-openings d and d, which lead, respectively, into the vertical escape-pipes F and smoke-flue G.

Opposite. the air pipes E, and similarly held in the base and top of the combustionehamber, are the open-ended air-pipes E, in clined as shown, in order to present great exposure to the products of combustion.

From the expanded top portion, D, of the combustionschamber extends the smoke-flue G, fitted to the discharge-opening (Z and con neeting the combustion-chamber directly with the chimney-flue. This flue G is provided with the damper-valve g, operated by a suitable hand-rod without the furnace, and with elbow-pipeg, the function of which will presently appear.

From the lower side of the portion D of the combustionchamber, and having their ends fitted to the openings cl therein, extends the series of vertical escapepipes F, preferably four or more in number, the lower ends of which pipes are suitably connected to the box H, having openings therein for such pipes, and having corresponding openings for the adjoining series of vertical escape pipes F. The upper ends of the pipes F are joined to the short projecting pipes h of the upper box, H, to the short pipes h of which box are con nected the upper ends of the escape-pipes F, which rest upon the lower box, H, having openings for said pipes and for the vertical escape-pipes F". The tops of the pipes F are joined to the short pipes h on the under side of the box H which connects with the elbowpipe g of the smoke flue G. The boxes H, H, and H are provided, as shown, with suitable openings, h", through which soot depos ited therein may be withdrawn.

From the foregoing description the operation of the furnace will be seen to be as follows: Fire having been started in the firebox, the valvedamper y will be turned so as to permit the products of combustion to pass ICO through the smoke-flue G directly to the chimney until the fire is well started, when this damper may be closed and the hot products of combustion be forced to pass to the chimney through the several series of escape-pipes, which, together with the upper and lower boxes, constitute sinuous channels therefor. By thus directing the products of combustion through separate channels a much larger surface of heated pipe is exposed to the incoming air, so that such products will be robbed of all available heat before passing into the chimney. The damper-valve g will further serve to control the heating action of the furnace, as by this means more or less of the hot products of combustion may be allowed to escape directly to the chimney through the smoke-flue without being fully utilized. The air-pipes E, located as shown, serve not only to highly heat the air passing through them, but also serve to cause a more uniform distribution of the products of combustion through the several series of escape-pipes.

It will be observed that the inductionports are so placed in the base of the furnace as to admit the air at such points that it can circulate freely around the heater, through the rows of air-pipes, and around the vertical escape-pipes before passing into the dischargefiue c in the dome of the furnace.

By the above-described construction of fur-' nace a very large surface exposure of heated pipe is secured, and the air is delivered to the furnace in such manner as to insure a most effective circulation over such surface. Moreover, the arrangement of the escape-pipes for the products of combustion in vertical rows, connected by common boxes, offers little chance for the deposit of soot upon the pipes and permits the ready cleaning of the boxes.

It is to be understood that modification may be made of the precise structure and arrangement shown without departing from the spirit of the invention. Thus, for example, the air-pipes E may be omitted, or the number of escape-pipes may be varied as desired.

I am aware that it has been heretofore proposed to connect the fire-box with the chimney-flues by a single row of escape-pipes verthe heat of the outgoing products of combustion so thoroughly utilized as in my improved furnace. The arrangement of the series of vertical rows of escape-pipes causes the products of combustion to be divided and to pass through a portion of the furnace, where their heat will be more effectively abstracted than would be the case were they placed horizontally on top of the combustion-chamber, where they would be exposed only to the partiallyheated air. Moreover, by connecting the upper smoke-flue with the last of the series of escape-pipes, the deposit of soot therefrom into the intermediate pipes is avoided,and by arranging the boxes connecting the escapepipes separately the cold air is allowed to circulate around the same, so as to abstract the heat therefrom.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, in a hotair furnace having suitable ports for. the admission and discharge of air, of the fire-box, the combustion-chamber havinga series of escape-pipes, and the series of open-ended air-tubes extending from top to bottom of said combustionchamber in front of the series of escape-pipes, whereby an even distribution of the products of combustion around the air-tubes is effected, substantially as described.

2. In a hot-air furnace, the combination, with the fire-box and combustion-chamber, of the series of rows of separate vertical escapepipes F, F, F, and F, the upper and lower boxes, H, H, H and H arranged independently of each other, and the smoke-flue G,connected with the box H and independent of the other boxes, and provided with the damper 9 substantially as described.

3. In a hot -air furnace, the combination, with the firebox and combustion-chamber, of the row ofopen-ended pipes extending through the combustion chamber in front of the outlets for the products of combustion, and the rows of vertical escape-pipes connected together at their tops and bottoms to form separate sinuous channels for the products of combustion, and connected to the combustionchamber with relation to the open-ended airtubes, in substantially the manner shown and described.

In testimony whereof I have hereunto set my hand this 23th day of January, 1884.

ABRAM MANN.

Witnesses:

ROBERT W. QUARLES, JOHN MAOLELLAN. 

